Some say that country radio is being hijacked by young artists who are influenced by Justin Timberlake and Bruno Mars, all under the guise that “country music should evolve.” Well, judging by the 18,000 people packed into the legendary Merriweather Post Pavilion in Columbia, MD, to see Frank Turner, Jason Isbell and Chris Stapleton, there’s a strong contingent of country fans who are more than willing to embrace a more organic...